.big_d{
    height: 50px;
    background: red;
}
.min_d{
    width:1200px ;
    height:100% ;
    background: red;
    margin: auto;
    ul{
        li{
            width: 100px;
            height: 50px;
            text-align: center;
            line-height: 50px;
            display: inline-block;
            // list-style: none;
            // float: left;
        }
    }
}